20 files translated to JP including synch-media section

[gitlocalize-app[bot]]

See review request for accessibilityHazard.html on GitLocalize See review request for dragging-movements.html on GitLocalize See review request for error-identification.html on GitLocalize See review request for error-prevention-all.html on GitLocalize See review request for error-prevention-legal-financial-data.html on GitLocalize See review request for error-suggestion.html on GitLocalize See review request for extended-audio-description-prerecorded.html on GitLocalize See review request for images-selection.html on GitLocalize See review request for images-text-based.html on GitLocalize See review request for images-text.html on GitLocalize See review request for indexes.html on GitLocalize See review request for lists.html on GitLocalize See review request for overlays.html on GitLocalize See review request for images-icons.html on GitLocalize See review request for index.html on GitLocalize See review request for MathML.html on GitLocalize See review request for none.html on GitLocalize See review request for index.html on GitLocalize See review request for highlight.html on GitLocalize See review request for tables.html on GitLocalize